1″ EverWear Bit Guard by Techniglass. Specially designed for use with The Grinder. Durable stainless steel. The EverWear Bit Guard fits snuggly into the opening on The Grinder Grid. Unlike plastic guards, the EverWear Bit Guard’s robust stainless steel composition will not scratch glass. The two sizes allow use for intricate and grander glass pieces. Also available in 3/4″: ( 3/4″ EverWear Bit Guard )